化学
路易斯酸
反应性(心理学)
阳离子聚合
催化作用
苯
烷基化
药物化学
锑
猝灭(荧光)
有机化学
荧光
病理
物理
替代医学
医学
量子力学
作者
Omar Coughlin,Tobias Krämer,Sophie L. Benjamin
标识
DOI:10.1021/acs.organomet.2c00426
摘要
Organopnictogen cations show promise as powerful, tunable main-group Lewis acid catalysts. The synthesis, solid-state structures, and reactivity of a series of weakly coordinated triarylchlorostibonium salts [Ar3SbCl][B(C6F5)4] (Ar = Ph, 3-FC6H4, 4-FC6H4, 3,5-F2C6H3, 2,4,6-F3C6H2) are reported. The cation in each adopts a tetrahedral coordination environment of antimony, with near complete separation from the anion. Structural, computational, and reactivity studies reveal that the Lewis acidity of [Ar3SbCl]+ generally increases with increased fluorination of the Ar substituents, with a secondary quenching effect from para fluorination. [Ar3SbCl]+ is reduced to Ar3Sb in the presence of Et3SiH, and the mechanism of this reaction has been modeled computationally. Preliminary studies demonstrate that they are useful catalysts for the dimerization of 1,1-diphenylethylene and the Friedel–Crafts alkylation of benzene.
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